The pictures of the flat bars used to support the rack are a DIY mod .
The original Peer Gynt rack support used twin solid bars tapped and screwed at one end and fitted to a T shaped plate mounted near the black rubber shocker
So a flat bar copycat solution is unlikely to work
I could provide a template drawing and dimensions and pictures
from a brand new Radius Peer Gynt as part of my *stock
....but that would be 3/4 weeks because of my current workload
* open to serious offers for probably the last unridden and mint condition PG in the world